Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealing
Developing magnesium alloys with both high corrosion resistance and superior mechanical properties is a long-standing challenge for the lightweight metal community. Herein, processing route combining equal-channel angular pressing (ECAP) and water annealing to achieve simultaneous improvements on bo...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-03-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127519300589 |
| _version_ | 1811345319916470272 |
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| author | Dan Song Cheng Li Ningning Liang Falin Yang Jinghua Jiang Jiapeng Sun Guosong Wu Aibin Ma Xiaolong Ma |
| author_facet | Dan Song Cheng Li Ningning Liang Falin Yang Jinghua Jiang Jiapeng Sun Guosong Wu Aibin Ma Xiaolong Ma |
| author_sort | Dan Song |
| collection | DOAJ |
| description | Developing magnesium alloys with both high corrosion resistance and superior mechanical properties is a long-standing challenge for the lightweight metal community. Herein, processing route combining equal-channel angular pressing (ECAP) and water annealing to achieve simultaneous improvements on both anti-corrosion and mechanical performances of a Mg-2Zn-Mn-Ca-Ce alloy is proposed. The cast alloy was ECAP-processed at 573 k for 12 passes to obtain ultra-fine grains (UFG), followed by water annealing in the autoclave under 160 °C for 3 h. The treated sample exhibits significantly improved corrosion resistance, presenting less corrosion current density and hydrogen evolution rate in the Hanks' solution. The doubled yield/ultimate strength and elongation, as well as the better-maintained mechanical integrity after corrosion, were achieved simultaneously. The profuse dislocations and grain boundaries in the UFG substrate offer intensive hydrothermal-reaction driving force, favoring the formation of a thicker and more compact Mg(OH)2 coating layer. Such a protective coating layer together with the annealed substrate with fewer crystal defects effectively retards the corrosion degradation and preserves the mechanical integrity afterwards. Meanwhile, the modified heterogeneous substrate microstructure results in the observed superior strength-ductility synergy. The proposed processing route and the resulted comprehensive properties should be applicable to other magnesium alloys as well. Keywords: Magnesium alloy, High strength and corrosion resistance, Materials processing, Heterogeneous microstructure |
| first_indexed | 2024-04-13T20:01:23Z |
| format | Article |
| id | doaj.art-97269e3d937f4f508bd7a8529f33911f |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-13T20:01:23Z |
| publishDate | 2019-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-97269e3d937f4f508bd7a8529f33911f2022-12-22T02:32:12ZengElsevierMaterials & Design0264-12752019-03-01166Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealingDan Song0Cheng Li1Ningning Liang2Falin Yang3Jinghua Jiang4Jiapeng Sun5Guosong Wu6Aibin Ma7Xiaolong Ma8College of Mechanics and Materials, Hohai University, Nanjing 210098, China; Suqian Research Institute, Hohai University, Suqian 223800, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaSchool of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, China; Suqian Research Institute, Hohai University, Suqian 223800, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, ChinaCollege of Mechanics and Materials, Hohai University, Nanjing 210098, China; Suqian Research Institute, Hohai University, Suqian 223800, China; Correspondence to: A. Ma, College of Mechanics and Materials, Hohai University, Nanjing 210098, China.Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA; Corresponding author.Developing magnesium alloys with both high corrosion resistance and superior mechanical properties is a long-standing challenge for the lightweight metal community. Herein, processing route combining equal-channel angular pressing (ECAP) and water annealing to achieve simultaneous improvements on both anti-corrosion and mechanical performances of a Mg-2Zn-Mn-Ca-Ce alloy is proposed. The cast alloy was ECAP-processed at 573 k for 12 passes to obtain ultra-fine grains (UFG), followed by water annealing in the autoclave under 160 °C for 3 h. The treated sample exhibits significantly improved corrosion resistance, presenting less corrosion current density and hydrogen evolution rate in the Hanks' solution. The doubled yield/ultimate strength and elongation, as well as the better-maintained mechanical integrity after corrosion, were achieved simultaneously. The profuse dislocations and grain boundaries in the UFG substrate offer intensive hydrothermal-reaction driving force, favoring the formation of a thicker and more compact Mg(OH)2 coating layer. Such a protective coating layer together with the annealed substrate with fewer crystal defects effectively retards the corrosion degradation and preserves the mechanical integrity afterwards. Meanwhile, the modified heterogeneous substrate microstructure results in the observed superior strength-ductility synergy. The proposed processing route and the resulted comprehensive properties should be applicable to other magnesium alloys as well. Keywords: Magnesium alloy, High strength and corrosion resistance, Materials processing, Heterogeneous microstructurehttp://www.sciencedirect.com/science/article/pii/S0264127519300589 |
| spellingShingle | Dan Song Cheng Li Ningning Liang Falin Yang Jinghua Jiang Jiapeng Sun Guosong Wu Aibin Ma Xiaolong Ma Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealing Materials & Design |
| title | Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealing |
| title_full | Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealing |
| title_fullStr | Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealing |
| title_full_unstemmed | Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealing |
| title_short | Simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal-channel angular pressing and post water annealing |
| title_sort | simultaneously improving corrosion resistance and mechanical properties of a magnesium alloy via equal channel angular pressing and post water annealing |
| url | http://www.sciencedirect.com/science/article/pii/S0264127519300589 |
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